CN104640337A - Automatic exposure control system - Google Patents
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- CN104640337A CN104640337A CN201310559900.5A CN201310559900A CN104640337A CN 104640337 A CN104640337 A CN 104640337A CN 201310559900 A CN201310559900 A CN 201310559900A CN 104640337 A CN104640337 A CN 104640337A
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Abstract
Disclosed is an automatic exposure control system which comprises a high pressure controller, an ionization chamber, a high pressure generator and a correcting unit. The correcting unit is connected with the high pressure controller and the ionization chamber and is suitable for receiving a field selection signal or/and an automatic exposure control threshold sent by the high pressure controller, selecting a gain coefficient corresponding to the received field selection signal or/and automatic exposure control threshold so as to correct a detection signal sent by the ionization chamber and sending the correction result to the high pressure generator; the high pressure generator is connected with the high pressure controller and suitable for receiving the automatic exposure control threshold and stopping sending the control signal when the correction result sent by the correction unit is equal to the automatic exposure control threshold. The automatic exposure control system corrects the detection signal sent by the ionization chamber to enable exposure time to be more accurate, so that imaging effect of exposure is improved, and images formed by exposure confirm to requirements.
Description
Technical field
The present invention relates to technical field of medical instruments, particularly a kind of automatic exposure control system.
Background technology
Along with the development of technology, for making every effort to produce optimum best image with minimum possible radiation dose, increasing X ray medical diagnostic equipment have employed auto-exposure control (AEC, Automatic Exposure Control) technology.
Auto-exposure control is the technology that X-ray production apparatus is conventional when shooting operation, its general principle is: utilize the devices such as photodiode to detect X ray, and transform into the signal of telecommunication and be sent to AEC parts, AEC parts do integral operation to the signal of telecommunication, and feed back to high pressure generator.Along with the increase of time for exposure, accumulation magnitude of voltage increases, and when the magnitude of voltage of Real-time Feedback reaches a certain threshold voltage (namely corresponding to a certain image brightness), high pressure generator exports exposure stop signal, X ray bulb no longer produces X ray under the control of high pressure generator, and exposure stops.
Ionization chamber is a kind of gas detector of detecting ionizing radiation, is oppositely arranged with X ray bulb.In use, detected person is positioned at the centre of ionization chamber and X ray bulb, and the X-ray transparent human exposure that X ray bulb is launched is to ionization chamber.When x-ray bombardment ionization chamber, can form ionization current in ionization chamber, this ionization current is proportional to the intensity of X ray.Ionization chamber is by this ionization current by being converted into voltage after processing of circuit, and the life period of this ionization current is longer, and the voltage after conversion is larger.That is, different X-ray intensity and radiated time can cause the amplitude of output voltage different.
Usually, when position is determined, the intensity of X ray is also determined, the size of the voltage that ionization chamber exports in its rated voltage output area is directly proportional to radiated time, so namely AEC technology is automatically control the time for exposure to make the image of formation obtain optimum brightness effects.
Fig. 1 shows existing a kind of automatic exposure control system.As shown in Figure 1, described automatic exposure control system comprises: dual pressure controller 10, high pressure generator 20 and ionization chamber 30.
Described high pressure generator 20 starts bulb 40 and starts unwrapping wire under the control of described dual pressure controller 10.
Described dual pressure controller 10 is also suitable for sending field and selects signal to described ionization chamber 30, and sends auto-exposure control threshold value to described high pressure generator 20.
Described ionization chamber 30 be suitable for detecting select signal corresponding with described field field in x-ray dose, and convert the x-ray dose detected to magnitude of voltage.
Described high pressure generator 20 receives the magnitude of voltage of described auto-exposure control threshold value and described ionization chamber 30 output, when the magnitude of voltage that described ionization chamber 30 exports equals described auto-exposure control threshold value, the voltage and current needed for X ray launched by described high pressure generator 20 stopping output bulb 40, and described bulb 40 stops launching X ray.
More contents about automatic exposure control system can be the Chinese patent application of CN102599923A with reference to publication number.In a particular application, the signal that existing automatic exposure control system cannot realize ionization chamber exports corrects, thus makes the average gray exposing the image formed undesirable.
In prior art, the average gray of the image that each exposure is formed may depart from optimum average gray, thus the quality of effect diagram picture, or although the average gray of image does not depart from optimum average gray, but the image of this average gray does not also meet demand, i.e. the quality of the image of the automatic exposure control system formation of prior art is not ideal.
Automatic exposure control system provided by the invention can control time for exposure and exposure dose more accurately by increasing correcting unit, and average gray corresponding to correcting unit adaptive adjustment automatic exposure threshold value can be passed through, thus obtain desirable picture quality.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail specific embodiments of the invention below in conjunction with accompanying drawing.
Summary of the invention
What the present invention solved is the problem that in prior art, the average gray of image is undesirable.
For solving the problem, the invention provides a kind of automatic exposure control system, comprising:
Dual pressure controller, is suitable for sending field and selects signal and auto-exposure control threshold value;
Ionization chamber, connects described dual pressure controller, is suitable for receiving described field and selects signal, and select the roentgen dose X in field corresponding to signal to convert magnitude of voltage to form detection signal by what detect with described field;
Correcting unit, connect described dual pressure controller and described ionization chamber, being suitable for receiving described field selects signal or/and auto-exposure control threshold value, select to select signal with the described field received or/and the corresponding gain coefficient of auto-exposure control threshold value corrects with the detection signal sent described ionization chamber, and correction result is sent to high pressure generator;
Described high pressure generator connects described dual pressure controller, is suitable for receiving described auto-exposure control threshold value, and stops when the correction result that described correcting unit sends equals described auto-exposure control threshold value transmitting control signal.
Alternatively, described correcting unit is suitable for receiving described field selection signal; Described correcting unit comprises:
First memory cell, is suitable for field compound mode and field balancing gain coefficient one_to_one corresponding to store;
First transfers unit, is suitable for selecting signal to determine a compound mode according to described field, and from described first memory cell, transfers corresponding field balancing gain coefficient according to the field compound mode determined;
First processing unit, connects described first and transfers unit and ionization chamber, and the magnitude of voltage and described first being suitable for the detection signal sent by described ionization chamber transfers field balancing gain multiplication that unit transfers to draw described correction result.
Alternatively, described correcting unit is also suitable for receiving described auto-exposure control threshold value, and described correcting unit also comprises:
Second memory cell, is suitable for storing the threshold exposure gain coefficient corresponding with auto-exposure control threshold value;
Second transfers unit, and the auto-exposure control threshold value being suitable for sending according to described dual pressure controller transfers corresponding threshold exposure gain coefficient from described second memory cell;
Described first processing unit, also connect described second and transfer unit, the magnitude of voltage and described first being suitable for the detection signal sent by described ionization chamber is transferred field balancing gain coefficient and described second that unit transfers and is transferred threshold exposure gain coefficient that unit transfers and be multiplied by mutually and draw described correction result.
Alternatively, described correcting unit is suitable for receiving described auto-exposure control threshold value, and described correcting unit comprises:
Second memory cell, is suitable for storing the threshold exposure gain coefficient corresponding with auto-exposure control threshold value;
Second transfers unit, and the auto-exposure control threshold value being suitable for sending according to described dual pressure controller transfers corresponding threshold exposure gain coefficient from described second memory cell;
Second processing unit, connects described second and transfers unit and ionization chamber, and the magnitude of voltage and described second being suitable for the detection signal sent by described ionization chamber is transferred threshold exposure gain coefficient that unit transfers and is multiplied by mutually and draws described correction result.
Alternatively, described automatic exposure control system also comprises: the matching unit be connected with described correcting unit, and described high pressure generator connects described correcting unit by described matching unit; The matching factor that described matching unit is suitable for according to presetting mates the correction result that described correcting unit sends, and matching result is sent to described high pressure generator, described matching factor is the ratio of the maximum of the auto-exposure control threshold value of described high pressure generator and the maximum of described ionization chamber output voltage.
Alternatively, described automatic exposure control system also comprises: the matching unit be connected with described ionization chamber, and described correcting unit connects described ionization chamber by described matching unit; The matching factor that described matching unit is suitable for according to presetting mates the detection signal that described ionization chamber sends, and matching result is sent to described correcting unit, described matching factor is the ratio of the maximum of the auto-exposure control threshold value of described high pressure generator and the maximum of described ionization chamber output voltage.
Alternatively, described automatic exposure control system also comprises: the bulb be connected with described high pressure generator, and described control signal is suitable for controlling described bulb divergent-ray.
Alternatively, described control signal comprises voltage signal and current signal.
Compared with prior art, technical scheme of the present invention has the following advantages:
Automatic exposure control system of the present invention comprises correcting unit, and described correcting unit can select signal behavior corresponding field balancing gain coefficient to correct with the detection signal sent ionization chamber based on field.Correction result after correction has nothing to do from the different fields compound mode of ionization chamber, and it is only relevant with roentgen dose X.That is, automatic exposure control system of the present invention is when position is certain, the impact that the field that its time for exposure can not be subject to ionization chamber is selected, therefore, the average gray of the image adopting automatic exposure control system of the present invention exposure to be formed is corresponding with auto-exposure control threshold value all the time, there is difference in the average gray avoiding the image causing multiexposure, multiple exposure to be formed due to field selection difference, thus improves the stability of picture quality, makes the final picture quality obtained more desirable.
In addition, the correcting unit in technical solution of the present invention can also select the gain coefficient corresponding with auto-exposure control threshold value to correct with the detection signal sent described ionization chamber.By arranging the different gain coefficients corresponding with described auto-exposure control threshold value, the correction result that described correcting unit draws also can be different, and then can control the different time for exposure.In this technical scheme, do not need to change the average gray that auto-exposure control threshold value can adjust the image of exposure adaptively, thus widened the scope of the average gray of the image corresponding with auto-exposure control threshold value, and then make the average gray of the final image obtained more desirable, realistic clinical demand.
Further, automatic exposure control system of the present invention can also comprise matching unit, and described matching unit can mate the detection signal of ionization chamber or mate the correction result of correcting unit.By arranging described matching unit, the time for exposure can be controlled more accurately, thus further increase the image quality of image.
Accompanying drawing explanation
Fig. 1 is the structural representation of automatic exposure control system in prior art;
Fig. 2 is the structural representation of automatic exposure control system embodiment one of the present invention;
Fig. 3 is the structural representation of the first implementation of correcting unit in Fig. 2;
Fig. 4 is the structural representation of the second implementation of correcting unit in Fig. 2;
Fig. 5 is the structural representation of the third implementation of correcting unit in Fig. 2;
Fig. 6 is the structural representation of automatic exposure control system embodiment two of the present invention;
Fig. 7 is the structural representation of automatic exposure control system embodiment three of the present invention.
Embodiment
Embodiment one
Ionization chamber is the detector of ray launched for detecting bulb, usually has field, three, left, center, right, in actual applications, can select separately each of ionization chamber or combine selection.
The field, three, left, center, right of ionization chamber is in the diverse location in X ray open country, and the Energy distribution in X ray open country is uneven, and the energy of the midfield internal X-ray of usual ionization chamber is maximum, and the X-ray energy in the Zuo Chang of ionization chamber and right field is less.In prior art, ionization chamber can produce different testing results based on the difference of selected field.
Such as, suppose the T1 moment, the dosage of the X ray in left field, midfield and right field is respectively A Gy(Gray, Gray), B Gy and A Gy, wherein A<B.
The first field is selected: select field, three, left, center, right, and the dosage of the X ray that T1 moment ionization chamber detects is (A+B+A)/3Gy=(2A+B)/3, and the detection signal that ionization chamber exports is a1V.
The second field is selected: only select left field, and the dosage of the X ray that T1 moment ionization chamber detects is A Gy; The detection signal that ionization chamber exports is a2V.Due to A<B, (2A+B)/3>A, then: a2<a1.
Suppose that auto-exposure control threshold value is a1V again; So known: the first field is selected namely to stop exposure in the T1 moment; And the second field is selected not reach described auto-exposure control threshold value a1V in the T1 moment, therefore, continuation is exposed, until reach preset value just can stop exposure.But in fact, when carrying out the second field and select and final stopping exposing, the x-ray dose in three fields of described ionization chamber has exceeded the dosage corresponding to best average gray of image.Therefore, also just result between the average gray of the image that exposure is formed and best average gray and occur deviation.
In view of the foregoing, the invention provides a kind of automatic exposure control system comprising correcting unit, the different field selection signal behavior that described correcting unit can send according to dual pressure controller goes out different gain coefficients and corrects with the detection signal sent ionization chamber.Avoid due to the field selection difference of ionization chamber through overcorrect and cause the average gray exposing the image formed to occur the problem of deviation.
Fig. 2 shows the structural representation of automatic exposure control system embodiment one of the present invention.With reference to figure 2, described automatic exposure control system can comprise: dual pressure controller 100, ionization chamber 200, correcting unit 300 and high pressure generator 400.
Described dual pressure controller 100, is suitable for sending field and selects signal and auto-exposure control threshold value;
Described ionization chamber 200, connects described dual pressure controller 100, is suitable for receiving described field and selects signal, and select the roentgen dose X in field corresponding to signal to convert magnitude of voltage to form detection signal by what detect with described field;
Described correcting unit 300, connect described dual pressure controller 100 and described ionization chamber 200, being suitable for receiving described field selects signal or/and auto-exposure control threshold value, select to select signal with the described field received or/and the corresponding gain coefficient of auto-exposure control threshold value corrects with the detection signal sent described ionization chamber 200, and correction result is sent to high pressure generator 400;
Described high pressure generator 400 connects described dual pressure controller 100, is suitable for receiving described auto-exposure control threshold value, and stops transmitting control signal when the correction result that described correcting unit 300 sends equals described auto-exposure control threshold value.
In addition, described automatic exposure control system can also comprise the bulb 500 be connected with described high pressure generator 400.The control signal that described high pressure generator 400 sends comprises voltage signal for controlling described bulb 500 divergent-ray and current signal, when the correction result that described high pressure generator 400 receives equals auto-exposure control threshold value, high pressure generator 400 stops on-load voltage signal and current signal to bulb 500, and bulb 500 stops divergent-ray.
In actual applications, described high pressure generator 400 is also suitable under the control of described dual pressure controller 100, send described control signal (namely for controlling voltage signal and the current signal of described bulb 500 divergent-ray), and described bulb 500 starts unwrapping wire based on described control signal.Described bulb 500 start the process of divergent-ray and start-up course of the prior art similar, do not repeat them here.
Fig. 3 is the structural representation of the first implementation of correcting unit shown in Fig. 2.Particularly, with reference to figure 3, described correcting unit 300 can comprise: first transfers unit 301, first memory cell 302 and the first processing unit 303.Signal is selected in the field that described correcting unit 300 is suitable for receiving the transmission of described dual pressure controller 100, select signal to determine the field compound mode selecting signal corresponding with described field according to the field received, and select corresponding field balancing gain coefficient to correct with the detection signal sent described ionization chamber 200 according to the field compound mode determined.
Particularly, described first memory cell 302, is suitable for field compound mode and field balancing gain coefficient one_to_one corresponding to store.
Described field compound mode refers to the field compound mode of ionization chamber 200, in actual applications, can select according to the actual requirements to select separately the field, three, left, center, right of ionization chamber 200, or combination is selected.Namely described field compound mode refers to the different choice mode of three fields to ionization chamber 200, as only selected left field, only selection midfield or only selecting right field etc.; For another example the combination of left field and midfield, the combination of midfield and right field, combination of the combination of Zuo Chang and right field and left field, midfield and right field etc.
In addition, the difference of the detection signal that the selection difference due to the field to ionization chamber 200 can cause described ionization chamber 200 to obtain, therefore, each balancing gain coefficient corresponding from different fields compound mode is also not quite similar.In actual applications, according to application scenarios and actual demand, rational field balancing gain coefficient can be set to realize the field balance correction to ionization chamber 200.
Particularly, each balancing gain coefficient can obtain in the following manner: between bulb 500 and ionization chamber 200, place certain thickness decay body mould, and the X ray that namely bulb 500 is launched is irradiated on ionization chamber 200 through after described decay body mould; The midfield of ionization chamber 200 is selected to carry out detecting to obtain first detection signal corresponding with the default gray scale of image; The left field of ionization chamber 200 is selected to carry out detecting to obtain second detection signal corresponding with the default gray scale of image; Namely the magnitude of voltage of described first detection signal has been drawn divided by the magnitude of voltage of described second detection signal the field balancing gain coefficient corresponding to the field compound mode of " left field ".
Similarly, the right field of ionization chamber 200 is selected to carry out detecting to obtain three detection signal corresponding with the default gray scale of image; Namely the magnitude of voltage of described first detection signal has been drawn divided by the magnitude of voltage of described 3rd detection signal the field balancing gain coefficient corresponding to the field compound mode of " right field ".By that analogy, more respectively to ionization chamber 200 do the selection of other field compound mode and draw the detection signal corresponding to field compound mode respectively; Be divided by the magnitude of voltage of detection signal corresponding with each compound mode for the magnitude of voltage of described first detection signal the field balancing gain coefficient drawn corresponding to various fields compound mode.
Certainly, in other embodiments, can also obtain the field balancing gain coefficient corresponding with field compound mode according to other modes, the present invention does not limit this.
Continue with reference to figure 3, described first transfers unit 301 connects described dual pressure controller 100, the field being suitable for receiving the transmission of described dual pressure controller 100 is selected signal, is selected signal to determine a compound mode according to described field, and from described first memory cell 302, transfers corresponding field balancing gain coefficient according to the field compound mode determined.
Described first processing unit 303, connects described first and transfers unit 301 and ionization chamber 200, and the magnitude of voltage and described first being suitable for the detection signal sent by described ionization chamber 200 transfers field balancing gain multiplication that unit 301 transfers to draw correction result.
Described correction result is sent to described high pressure generator 400, and described high pressure generator 400 stops transmitting control signal when described correction result equals the auto-exposure control threshold value of described dual pressure controller 100 transmission.
Correcting unit as shown in Figure 3 selects signal behavior corresponding field balancing gain coefficient to carry out a balance correction with the detection signal sent described ionization chamber based on field.Correction result after overcorrect is not by the impact of the different fields compound mode of described ionization chamber, like this, when position is determined, the time for exposure of described automatic exposure control system is consistent, thus avoid owing to having carried out described ionization chamber different fields to select and cause the problem of the average gray off-target average gray exposing the multiple images formed, therefore automatic exposure control system of the present invention improves the stability of the picture quality of imaging, thus can obtain more desirable picture quality.
Further, from Such analysis: existing automatic exposure control system, in different field selection situations, may cause the x-ray dose in three of ionization chamber fields excessive, cause certain injury to the health of sufferer.And after the correction of automatic exposure control system of the present invention by described correcting unit, make when position is determined, the time of each exposure is all identical, thus efficiently avoid the harm that overexposure brings to sufferer, improves the accuracy of the roentgen dose X of transmitting.
Fig. 4 is the structural representation of the second implementation of correcting unit shown in Fig. 2.With reference to figure 4, described correcting unit 300' comprises: second transfers unit 311, second memory cell 312 and the second processing unit 313.Be suitable for receiving unlike: the correcting unit 300' in this implementation the auto-exposure control threshold value that described dual pressure controller 100 sends with correcting unit 300 shown in Fig. 3.
Described second memory cell 312, is suitable for storing the threshold exposure gain coefficient corresponding with auto-exposure control threshold value;
Described second transfers unit 311, connects described dual pressure controller 100, and the auto-exposure control threshold value being suitable for sending according to described dual pressure controller 100 transfers corresponding threshold exposure gain coefficient from described second memory cell 312;
Described second processing unit 313, connect described second and transfer unit 311 and ionization chamber 200, the magnitude of voltage and described second being suitable for the detection signal sent by described ionization chamber 200 is transferred threshold exposure gain coefficient that unit 311 transfers and is multiplied by mutually and draws described correction result.
Described high pressure generator 400 connects described dual pressure controller 100 and described second processing unit 313, stops transmitting control signal when the correction result being suitable for sending at described second processing unit 313 equals the auto-exposure control threshold value of described dual pressure controller 100 transmission.
In a particular application, for many high pressure generators, auto-exposure control threshold value is not to change arbitrarily and to adjust.After auto-exposure control threshold value is determined, the average gray of the image that its exposure is formed also is determined.In some cases, the average gray exposing the image of formation under the auto-exposure control threshold value determined can not meet the requirement of user, because auto-exposure control threshold value can not change, therefore need by selecting corresponding threshold exposure gain coefficient to carry out the average gray correcting to adjust the image that exposure is formed adaptively, with the clinical demand making the average gray of the final image formed realistic.
Such as, suppose that auto-exposure control threshold value is aV under normal circumstances, the average gray of the image that exposure is formed is G1; User is the image of G2 to ask under the auto-exposure control threshold value of aV exposure to form average gray, to reduce the x radiation x to patient to greatest extent.So, corresponding threshold exposure gain coefficient is G1/G2.
Particularly, the target gray that user can arrange image by human-computer interaction interface is G2; Dual pressure controller 100 receives described target gray G2, and sends it to second of correcting unit 300 and transfer unit 311; Described second transfers unit 311 obtains corresponding threshold exposure gain coefficient (G1/G2) from described second memory cell 312; The magnitude of voltage of the detection signal that described threshold exposure gain coefficient (G1/G2) exports with ionization chamber 200 by described second processing unit 313 is multiplied and obtains correcting result; Described high pressure generator 400 is when correcting result and equaling auto-exposure control threshold value aV, and stopping transmits control signal thus control described bulb 500 stops unwrapping wire.
Correcting unit 300' shown in Fig. 4 is suitable for selecting the threshold exposure gain coefficient corresponding with auto-exposure control threshold value to correct with the detection signal sent described ionization chamber.By arranging different threshold exposure gain coefficients, the correction result that described correcting unit 300' draws also can be different, and then can control the different time for exposure.In this technical scheme, do not need to change the average gray that auto-exposure control threshold value can adjust the image of exposure adaptively, in other words, the basis not changing auto-exposure control threshold value has been widened the scope of exposure dose.Which improves flexibility and the practicality of automatic exposure control system of the present invention, namely higher picture quality can be selected according to the actual requirements, also suitably can reduce the quality of image, reduction picture quality can reduce the roentgen dose X needed for radiation, thus reduces ray to the radiation of patient.
Fig. 5 is the structural representation of the third implementation of correcting unit shown in Fig. 2.With reference to figure 5, described correcting unit 300'' comprises: first transfers unit 301, first memory cell 302, first processing unit 303, second transfers unit 311 and the second memory cell 312.
In this implementation, signal and auto-exposure control threshold value are selected in the field that described correcting unit 300'' is suitable for receiving the transmission of described dual pressure controller 100.Particularly:
Described first memory cell 302, is suitable for field compound mode and field balancing gain coefficient one_to_one corresponding to store.
Described first transfers unit 301 connects described dual pressure controller 100, the field being suitable for receiving the transmission of described dual pressure controller 100 is selected signal, is selected signal to determine a compound mode according to described field, and from described first memory cell 302, transfers corresponding field balancing gain coefficient according to the field compound mode determined.
Described second memory cell 312, is suitable for storing the threshold exposure gain coefficient corresponding with auto-exposure control threshold value.
Described second transfers unit 311, connects described dual pressure controller 100, and the auto-exposure control threshold value being suitable for sending according to described dual pressure controller 100 transfers corresponding threshold exposure gain coefficient from described second memory cell 312.
Described first processing unit 303 connects described first and transfers unit 301, described second and transfer unit 311, described ionization chamber 200 and described high pressure generator 400.The magnitude of voltage and described first that described first processing unit 303 is suitable for the detection signal sent by described ionization chamber 200 is transferred field balancing gain coefficient and described second that unit 301 transfers and is transferred threshold exposure gain coefficient that unit 311 transfers and be multiplied by mutually and draw correction result.
Described high pressure generator 400 receives the described correction result that described first processing unit 303 sends, and stops transmitting control signal when described correction result equals the auto-exposure control threshold value of described dual pressure controller 100 transmission.Namely described high pressure generator 400 stops described bulb 500 on-load voltage and electric current, and described bulb 500 stops divergent-ray.
In a particular application, described first memory cell 302 and described second memory cell 312 can adopt existing memory, as flash memory etc. realizes memory function; Further, described first memory cell 302 and described second memory cell 312 can be respectively two memories, and a memory also can be adopted to realize, and the present invention does not limit this.
Embodiment two
After the detection signal obtained ionization chamber to have carried out correcting, the average gray of the image that exposure is formed still may the average gray of off-target.Inventor is to this has been careful research and analysis:
Described high pressure generator 400 is when different KV, all there is the auto-exposure control threshold value corresponding with this KV (desired value also referred to as cut-ff voltage or AEC), actually determine in the process of auto-exposure control threshold value, first by the acquisition of the auto-exposure control threshold value of benchmark KV, N Reference Alignment voltage can be obtained.And for the acquisition of the auto-exposure control threshold value under other KV, then can obtain by carrying out correction to this N Reference Alignment voltage.Therefore, the auto-exposure control threshold value of high pressure generator 400 under different K V is positioned within certain scope, can be called the working range of AEC voltage.Correspondingly, the voltage that ionization chamber 200 exports also has certain limit, and after ionization chamber 200 reaches the work saturation region of own hardware, its voltage exported no longer increases along with the increase receiving dosage.
In actual applications, the working range of AEC voltage and described ionization chamber 200 output voltage range may and inconsistent, such as, the working range of AEC voltage is 0V ~ 2U1V, and the auto-exposure control threshold value that described dual pressure controller 100 sends is 1.2U1V; And the voltage range that described ionization chamber 200 exports is 0V ~ U1V.Like this, the scope of the magnitude of voltage that the detection signal that described ionization chamber 200 sends is formed after correcting unit 300 also may be inconsistent with the working range of the AEC voltage of described high pressure generator 400, such as, the working range of the voltage of described correcting unit 300 output may be 0.5U1V ~ UIV.In this case, the correction result that described correcting unit 300 sends can not equal described auto-exposure control threshold value 1.2U1V, therefore, described high pressure generator 400 can not stop transmitting control signal, thus causes described automatic exposure control system normally to work.
For solving the problem, making high pressure generator 400 and ionization chamber 200 can cooperating, present invention also offers another automatic exposure control system.Fig. 6 shows the structural representation of automatic exposure control system embodiment two of the present invention.With reference to figure 6, the difference part of the present embodiment and embodiment one is: described automatic exposure control system also comprises matching unit 600.Described high pressure generator 400 connects described correcting unit 300 by described matching unit 600.
The matching factor that described matching unit 600 is suitable for according to presetting mates the correction result that described correcting unit 300 sends, and matching result is sent to described high pressure generator 400.
Wherein, described matching factor is the ratio of the maximum of the auto-exposure control threshold value of described high pressure generator 400 and the maximum of described ionization chamber 200 output voltage.Such as, suppose that the scope of the auto-exposure control threshold value of described high pressure generator 400 is for [0V, 2U1V], then the maximum of described auto-exposure control threshold value is 2U1V; The scope of described ionization chamber 200 output voltage is [0V, U1V], then the maximum of described ionization chamber output voltage is U1V.So, described matching factor is 2U1/U1=2.
Described high pressure generator 400 stops sending a control signal to described bulb 500 when the matching result that described matching unit 600 sends equals the auto-exposure control threshold value of described dual pressure controller 100 transmission.
Described correcting unit 300 can adopt the various implementations in embodiment one to realize, and other unit in the present embodiment also can distinguish the appropriate section in reference example one, do not repeat them here.
Matching unit is added in the present embodiment, described matching unit is mated by the correction result obtained described correcting unit, the working range of AEC voltage and the output voltage range of ionization chamber are matched, thus time for exposure and exposure dose can be controlled more accurately, and then image is made to have best average gray.
Embodiment three
Fig. 7 shows the structural representation of automatic exposure control system embodiment three of the present invention.With reference to figure 7, the present embodiment is with the difference part of embodiment one: described automatic exposure control system also comprises: the matching unit 600 be connected with described correcting unit 300 with described ionization chamber 200, and described correcting unit 300 connects described ionization chamber 200 by described matching unit 600.
The matching factor that described matching unit 600 is suitable for according to presetting mates the detection signal that described ionization chamber 200 sends, and matching result is sent to described correcting unit 300.Wherein, described matching factor is the ratio of the maximum of the auto-exposure control threshold value of described high pressure generator 400 and the maximum of described ionization chamber output voltage.The definition of described matching factor can description in reference example two, does not repeat them here.
Described correcting unit 300 corrects the matching result that described matching unit 600 sends, and correction result is sent to described high pressure generator 400.Described high pressure generator 400 stops sending a control signal to described bulb 500 when the correction result that described correcting unit 300 sends equals the auto-exposure control threshold value of described dual pressure controller 100 transmission.
Described correcting unit 300 can adopt the various implementations in embodiment one to realize, and other unit in the present embodiment also can distinguish the appropriate section in reference example one, do not repeat them here.
In the present embodiment, first by described matching unit 600, the detection signal that described ionization chamber 200 obtains is mated, and then corrected by described correcting unit 300, make described high pressure generator 400 can control described bulb 500 accurately and stop divergent-ray, therefore can control time for exposure and exposure dose accurately, thus obtain desirable picture quality.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (8)
1. an automatic exposure control system, is characterized in that, comprising:
Dual pressure controller, is suitable for sending field and selects signal and auto-exposure control threshold value;
Ionization chamber, connects described dual pressure controller, is suitable for receiving described field and selects signal, and select the roentgen dose X in field corresponding to signal to convert magnitude of voltage to form detection signal by what detect with described field;
Correcting unit, connect described dual pressure controller and described ionization chamber, being suitable for receiving described field selects signal or/and auto-exposure control threshold value, select to select signal with the described field received or/and the corresponding gain coefficient of auto-exposure control threshold value corrects with the detection signal sent described ionization chamber, and correction result is sent to high pressure generator;
Described high pressure generator connects described dual pressure controller, is suitable for receiving described auto-exposure control threshold value, and stops when the correction result that described correcting unit sends equals described auto-exposure control threshold value transmitting control signal.
2. automatic exposure control system as claimed in claim 1, is characterized in that, described correcting unit is suitable for receiving described field and selects signal; Described correcting unit comprises:
First memory cell, is suitable for field compound mode and field balancing gain coefficient one_to_one corresponding to store;
First transfers unit, is suitable for selecting signal to determine a compound mode according to described field, and from described first memory cell, transfers corresponding field balancing gain coefficient according to the field compound mode determined;
First processing unit, connects described first and transfers unit and ionization chamber, and the magnitude of voltage and described first being suitable for the detection signal sent by described ionization chamber transfers field balancing gain multiplication that unit transfers to draw described correction result.
3. automatic exposure control system as claimed in claim 2, it is characterized in that, described correcting unit is also suitable for receiving described auto-exposure control threshold value, and described correcting unit also comprises:
Second memory cell, is suitable for storing the threshold exposure gain coefficient corresponding with auto-exposure control threshold value;
Second transfers unit, and the auto-exposure control threshold value being suitable for sending according to described dual pressure controller transfers corresponding threshold exposure gain coefficient from described second memory cell;
Described first processing unit, also connect described second and transfer unit, the magnitude of voltage and described first being suitable for the detection signal sent by described ionization chamber is transferred field balancing gain coefficient and described second that unit transfers and is transferred threshold exposure gain coefficient that unit transfers and be multiplied by mutually and draw described correction result.
4. automatic exposure control system as claimed in claim 1, it is characterized in that, described correcting unit is suitable for receiving described auto-exposure control threshold value, and described correcting unit comprises:
Second memory cell, is suitable for storing the threshold exposure gain coefficient corresponding with auto-exposure control threshold value;
Second transfers unit, and the auto-exposure control threshold value being suitable for sending according to described dual pressure controller transfers corresponding threshold exposure gain coefficient from described second memory cell;
Second processing unit, connects described second and transfers unit and ionization chamber, and the magnitude of voltage and described second being suitable for the detection signal sent by described ionization chamber is transferred threshold exposure gain coefficient that unit transfers and is multiplied by mutually and draws described correction result.
5. automatic exposure control system as claimed in claim 1, it is characterized in that, also comprise: the matching unit be connected with described correcting unit, described high pressure generator connects described correcting unit by described matching unit; The matching factor that described matching unit is suitable for according to presetting mates the correction result that described correcting unit sends, and matching result is sent to described high pressure generator, described matching factor is the ratio of the maximum of the auto-exposure control threshold value of described high pressure generator and the maximum of described ionization chamber output voltage.
6. automatic exposure control system as claimed in claim 1, it is characterized in that, also comprise: the matching unit be connected with described ionization chamber, described correcting unit connects described ionization chamber by described matching unit; The matching factor that described matching unit is suitable for according to presetting mates the detection signal that described ionization chamber sends, and matching result is sent to described correcting unit, described matching factor is the ratio of the maximum of the auto-exposure control threshold value of described high pressure generator and the maximum of described ionization chamber output voltage.
7. automatic exposure control system as claimed in claim 1, it is characterized in that, also comprise: the bulb be connected with described high pressure generator, described control signal is suitable for controlling described bulb divergent-ray.
8. automatic exposure control system as claimed in claim 1, it is characterized in that, described control signal comprises voltage signal and current signal.
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